CV79 interdigital magnetron
(related to CV89 which is a frequency variant).
This generates about 300mW at 6.6cm (4.55GHz).

The CV79 and CV89 were used
in Wireless Set No.10 Mk.I, which played an important part in the WWII
D-Day landings. This was a trailer mounted installation, using pulse modulation
to enable 8-channels (e.g. 8 phone lines) over a 50 mile (optical) path.
The associated receiver made use of the CV90. The
Mk. II version used two CV228 Heil tubes in the
transmitter instead of the CV79 or CV89.

Heater voltage

6.3V

Heater current

200mA

Max anode dissipation

8.5W

Magnetic field strength (approx)

650H

Frequency

4547MHz

Nominal output

200mW

Pin

Function

1

Heater

2

n/c

3

Anode

4

n/c

5

n/c

6

Heater/cathode

7

n/c

8

Anode

9

n/c

The 'interdigital' name
comes from the nature of the fingers shown in this picture.